ABBA (stylized ) was a Swedish pop group formed in Stockholm in 1972, comprising Agnetha Fältskog, Björn Ulvaeus, Benny Andersson, and Anni-Frid Lyngstad. ABBA is an acronym of the first letters of the band members' first names and is sometimes stylized as the registered trademark ᗅᗺᗷᗅ. The band became one of the most commercially successful acts in the history of popular music, topping the charts worldwide from 1975 to 1982. They won the Eurovision Song Contest 1974 at the Dome in Brighton, UK, giving Sweden its first triumph in the contest, and were the most successful group ever to take part in the competition. Ulvaeus and Andersson wrote the Broadway musical "Chess" in 1980.